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Is Disco Elysium based on some preexisting RPG system?
(lemmygrad.ml)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
No, but the core mechanic (rolling a 2d6 against a difficulty class modified by your skill value and conditional modifiers) is not too uncommon (ex: Traveller, Worlds Without Number). Resolving combat encounters as a series of normal skill rolls is also not too uncommon (ex: Blades in the Dark)